From d8ba65abc3714ea73bfc664ef9fa52029c60385d Mon Sep 17 00:00:00 2001 From: Pontus Borg Date: Wed, 10 Jun 2020 00:40:05 +0200 Subject: [PATCH] readme updates --- README.md | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index 37b042a..439e752 100644 --- a/README.md +++ b/README.md @@ -48,10 +48,23 @@ It is possible to fit different connectors for most functions. It is designed fo For a larger (>30) production run the boards would have to be panellized, which looks like a non-trivial task with KiCAD. If anyone has experience and wants to help ... -2020-06-04: +2020-06-10: -Version 0.4 in the works... +Version 0.4 is almost complete. +* It has an on-board 3.3V regulator replacing the external board. (Quite a challenge for an old SW engineer using JLCPCB's very limited selection of components) +* Thermistor connector moved down next to the fan/heater connectors +* Lower profile capacitor for the stepper driver, it was very tall. +* Debug header moved and extended. BOOT1 exposed. +* Serial pins removed, not very useful anyway +* Fan/heater connectors tweaked to be able to fit JST XH, screw terminals or Molex KK connectors. +* Added a micro-USB connector for easier flashing and possibly other features. The board is not powered from USB. +* Switched to an STM32F106, mainly to allow for a proper bootloader and flashing over USB. Or even over CAN if I develop a custom bootloader. With many boards it would be very nice to be able to bulk flash them all at once over CAN. + + +I have done thermal stress testing of the board. It can run a big stepper at 1.5A, board attached very close to the hot stepper with no forced airflow and 25C ambient. The driver reaches 90C (measured with a probe) but does not shut down due to overheating. The entire board heats up as designed to act as a heatsink, most inner and outer copper layers are groundplanes to spread the heat. + +I'll very soon order another 20-30 board to send out to brave beta testers. # Can Hat ![Can Hat](CanHat.jpg)